2003 Hyundai Tiburon temperature gauge reading

The temperature gauge on my gauge cluster reads almost hot. I replaced the thermostat, the sensor next to the thermostat and still reads almost to the "H". I know that usually you can turn your heater on to stop it from overheating, but when I do, it stays where it is. My fans dont come on unless I either. 1.)Unplug the sensor next to the thermostat, which will make it to where I cant read the gauge. Or 2.)Turn my A/C on which still doesnt make the gauge move. So I dont think it is the fans causing the problem, even though I know there's something wrong with them. I checked my hoses and they're tight. I dont think the car is actually overheating. So could the sensor I bought just be bad and need replaced or maybe a bad thermostat? Thank You for your help.
-Cody